Rapid decolouration of bromine solution serves as a test for the presence of the _____ in a compound. (A) C-C (B)C=C (C) C???C (D)C=O. ANS: B

Pyrolysis of alkanes particularly where petroleum is concerned is known as____(A) Cracking (B)Refining (C)Fractional distillation (D) combustion. ANS: A

When alkene reacts with borane, addition to the C=C takes place to yield organoborane a compound with a carbon-carbon bond, the reaction is known as____(A) hydrogenation (B)halogenation (C)hydroboration (D) hydrohalogenation. ANS: C

In­­­____compounds the molecules are formed by sharing of electron pairs between the constituent atoms. (A) non-covalent (B)electrovalent (C)ionic (D)covalent. ANS: D

Which of the compounds is sp^2 hybridized. (A)Alkene (B) alkanone (C)alkane (D)alkyne. ANS: A

_____ compound has benzene ring with a methyl group at the position one. (A) Aniline (B)phenol (C)Toulene (D) anisole. ANS: C

A benzene ring with $$ OCH_{3}$$ t position one, F at position two and $$CH_{3}$$ at position four is ____(A) 4-ethyl-2-fluorotoulene (B) 2-fluoro-4-ethyl toulene (C) 2-fluoro-4-ethylanisole (D) 4-ethyl-2-fluoroanisole. ANS: D

A benzene ring with a methyl group at position one and nitro group at position three is___(A) o?^’nitrobenzene (B) p?^’nitroxylen (C) o?^’nitroaniline (D) p?^’nitrotoulene. ANS: D